EN 61951-2:2017

Secondary cells and batteries containing alkaline or other non acid electrolytes - Secondary sealed cells and batteries for portable applications - Part 2: Nickel-metal hydride

IEC 61951-2:2011 specifies marking, designation, dimensions, tests and requirements for portable sealed nickel-metal hydride, small prismatic, cylindrical and button rechargeable single cells, suitable for use in any orientation. This third edition cancels and replaces the second edition published in 2003 of which it constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - clause 4: addition of 2 parameters; - clause 5: addition of cells type 'S' and cells type 'T'; - subclause 6.1.2: addition of new cylindrical cells; - subclause 7.8: addition of a specific test for 'S' cells.

Sekundärzellen und -batterien mit alkalischen oder anderen nichtsäurehaltigen Elektrolyten - Tragbare wiederaufladbare gasdichte Zellen und Batterien - Teil 2: Nickel-Metallhydrid

Accumulateurs alcalins et autres accumulateurs à électrolyte non acide - Accumulateurs étanches pour applications portables - Partie 2: Nickel-métal hydrure

NEW!IEC 61951-2:2017 est disponible sous forme de IEC 61951-2:2017 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 61951-2:2017 spécifie le marquage, la désignation, les dimensions, les essais et les exigences applicables aux éléments et batteries d’accumulateurs parallélépipédiques, cylindriques et boutons, étanches, au nickel-métal hydrure, pouvant être utilisés dans toutes les orientations, pour applications portables. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: - ajout du type de batterie; - ajout de la désignation ‘F’ (type à récupération élevée) pour les éléments et batteries; - ajout de la désignation ‘I’ (type à autodécharge faible) pour les éléments; - révision de la Figure 3 (6.1.3.1); - ajout de la note "picot facultatif" au contact positif; - modification de la position de la ligne de repère du picot aux surfaces planes du contact positif (B et G).

Sekundarni členi in baterije z alkalnimi ali drugimi nekislinskimi elektroliti - Sekundarni zatesnjeni členi in baterije za prenosne naprave - 2. del: Nikelj-kovinski hidrid

Standard IEC 61951-2:2011 določa označevanje, določanje, dimenzije, preskuse in zahteve za majhne posamezne prenosne ponovno polnljive hermetične nikelj-kovinske hidridne prizmatične, cilindrične in gumbaste celice, ki se uporabljajo pri vsaki orientaciji. Ta tretja izdaja razveljavlja in nadomešča drugo izdajo, objavljeno leta 2003, in predstavlja tehnično popravljeno izdajo. Ta izdaja vključuje naslednje pomembne tehnične spremembe glede na prejšnjo izdajo:  – točka 4: dodana sta 2 parametra;  – točka 5: dodane so celice tipa »S« in tipa »T«;  – podtočka 6.1.2: dodane so nove cilindrične celice;  – podtočka 7.8: dodan je poseben preskus za celice »S«.

General Information

• Status: Published
• Publication Date: 15-Jun-2017
• Withdrawal Date: 25-Apr-2020
• ICS: 29.220.30 - Alkaline secondary cells and batteries
• Technical Committee: CLC/TC 21X - Secondary cells and batteries
• Drafting Committee: IEC/SC 21A - IEC_SC_21A
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 16-Jun-2017
• Completion Date: 16-Jun-2017
• Ref Project: SIST EN 61951-2:2017 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Secondary sealed cells and batteries for portable applications - Part 2: Nickel-metal hydride

Relations

• Replaces: EN 61951-2:2011 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells - Part 2: Nickel-metal hydride
• Effective Date: 05-May-2015
• Amended By: EN 61951-2:2017/A1:2022 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Secondary sealed cells and batteries for portable applications - Part 2: Nickel-metal hydride
• Effective Date: 28-Sep-2021

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2017
1DGRPHãþD
SIST EN 61951-2:2011
6HNXQGDUQLþOHQLLQEDWHULMH]DONDOQLPLDOLGUXJLPLQHNLVOLQVNLPLHOHNWUROLWL
6HNXQGDUQL]DWHVQMHQLþOHQLLQEDWHULMH]DSUHQRVQHQDSUDYHGHO1LNHOMNRYLQVNL
KLGULG
Secondary cells and batteries containing alkaline or other non-acid electrolytes -
Secondary sealed cells and batteries for portable applications - Part 2: Nickel-metal
hydride
Akkumulatoren und Batterien mit alkalischem oder anderen nichtsäurehaltigen
Elektrolyten - Tragbare wiederaufladbare gasdichte Einzelzellen - Teil 2: Nickel-
Metallhydrid
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide - Accumulateurs
étanches pour applications portables - Partie 2: Nickel-métal hydrure
Ta slovenski standard je istoveten z: EN 61951-2:2017
ICS:
29.220.30 $ONDOQLVHNXQGDUQLþOHQLLQ Alkaline secondary cells and
EDWHULMH batteries
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 61951-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2017
ICS 29.220.30 Supersedes EN 61951-2:2011
English Version
Secondary cells and batteries containing alkaline or other non
acid electrolytes - Secondary sealed cells and batteries for
portable applications - Part 2: Nickel-metal hydride
(IEC 61951-2:2017)
Accumulateurs alcalins et autres accumulateurs à Akkumulatoren und Batterien mit alkalischem oder anderen
électrolyte non acide - Accumulateurs étanches pour nichtsäurehaltigen Elektrolyten - Tragbare wiederaufladbare
applications portables - Partie 2: Nickel-métal hydrure gasdichte Einzelzellen - Teil 2: Nickel-Metallhydrid
(IEC 61951-2:2017) (IEC 61951-2:2017)
This European Standard was approved by CENELEC on 2017-04-26. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61951-2:2017 E
European foreword
The text of document 21A/623/FDIS, future edition 4 of IEC 61951-2, prepared by SC 21A, Secondary
cells and batteries containing alkaline or other non-acid electrolytes, of IEC/TC 21 "Secondary cells
and batteries" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be (dop) 2018-01-26
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2020-04-26
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61951-2:2011.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights
Endorsement notice.
The text of the International Standard IEC 61951-2:2017 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60051 (series) NOTE Harmonized as EN 60051 (series).
IEC 60086 (series) NOTE Harmonized as EN 60086 (series).
IEC 61434 NOTE Harmonized as EN 61434.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-482 2004 International Electrotechnical Vocabulary - -
(IEV) -- Part 482: Primary and secondary
cells and batteries
IEC 60086-1 -  Primary batteries - Part 1: General EN 60086-1 -
IEC 60086-2 -  Primary batteries - Part 2: Physical and EN 60086-2 -
electrical specifications
IEC 61959 -  Secondary cells and batteries containing EN 61959 -
alkaline or other non-acid electrolytes -
Mechanical tests for sealed portable
secondary cells and batteries
IEC 62133-1 -  Secondary cells and batteries containing EN 62133-1 -
alkaline or other non-acid electrolytes -
Safety requirements for portable sealed
secondary cells, and for batteries made
from them, for use in portable applications
- Part 1: Nickel systems
IEC 61951-2 ®
Edition 4.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries containing alkaline or other non-acid

electrolytes – Secondary sealed cells and batteries for portable applications –

Part 2: Nickel-metal hydride
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –

Accumulateurs étanches pour applications portables –

Partie 2: Nickel-métal hydrure

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.30 ISBN 978-2-8322-4011-3

– 2 – IEC 61951-2:2017 © IEC 2017
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Parameter measurement tolerances . 9
5 Cell and battery designation and marking . 10
5.1 Cell and battery designation . 10
5.1.1 Small prismatic cells and cylindrical cells . 10
5.1.2 Button cells. 11
5.1.3 Batteries . 12
5.2 Cell or battery termination . 12
5.3 Marking . 12
5.3.1 Small prismatic cells and cylindrical cells . 12
5.3.2 Button cells. 13
5.3.3 Batteries . 13
5.4 Exemption of wording. 13
6 Dimensions. 13
6.1 Small prismatic cells and cylindrical cells . 13
6.1.1 General . 13
6.1.2 Small prismatic cells . 14
6.1.3 Cylindrical cells . 14
6.2 Button cells . 16
6.3 9 V type nickel-metal hydride batteries . 17
7 Electrical tests . 18
7.1 General . 18
7.2 Charging procedure for test purposes . 18
7.2.1 Charging procedure for cell. 18
7.2.2 Charging procedure for battery . 18
7.3 Discharge performance . 18
7.3.1 General . 18
7.3.2 Discharge performance at 20 °C . 19
7.3.3 Discharge performance at 0 °C . 20
7.3.4 Discharge performance for rapid charge cells (R cells) . 21
7.4 Charge (capacity) retention . 21
7.5 Endurance . 22
7.5.1 Endurance in cycles. 22
7.5.2 Permanent charge endurance . 25
7.6 Charge acceptance at constant voltage . 28
7.7 Overcharge . 28
7.7.1 Small prismatic, L, M, H, X, LS or MS cylindrical, and button cells . 28
7.7.2 LT/LU, MT/MU or HT/HU cylindrical cells . 29
7.7.3 J cylindrical cells . 29
7.7.4 JT cylindrical cells . 29
7.7.5 R cylindrical cells . 30
7.8 Safety device operation . 30
7.9 Surface temperature limitation device operation (for S cell only) . 30

IEC 61951-2:2017 © IEC 2017 – 3 –
7.10 Storage . 31
7.10.1 Button cells or batteries, small prismatic cells or batteries, cylindrical
cells or batteries . 31
7.10.2 Button cells or batteries, small prismatic cells or batteries, cylindrical
cells or batteries (high recovery type) . 32
7.11 Charge acceptance at +55 °C for LT, MT or HT cylindrical cells . 33
7.12 Trickle charge acceptance for JT cylindrical cells . 34
7.13 Internal resistance . 34
7.13.1 General . 34
7.13.2 Measurement of the internal AC resistance . 35
7.13.3 Measurement of the internal DC resistance . 35
8 Mechanical tests . 36
9 Safety requirements . 36
10 Type approval and batch acceptance .
...